package com.vortex.cloud.zhsw.xinyang.util;

import com.vortex.cloud.zhsw.xinyang.dto.response.GpsDTO;


/**
 * @author mumuwen
 * @date 2020-11-20 6:05 下午
 */
public class LonLatTest3 {

    /*
     * 大地坐标系资料WGS-84 长半径a=6378137 短半径b=6356752.3142 扁率f=1/298.2572236
     */
    /**
     * 长半径a=6378137
     */
    private double a = 6378137;
    /**
     * 短半径b=6356752.3142
     */
    private double b = 6356752.3142;
    /**
     * 扁率f=1/298.2572236
     */
    private double f = 1 / 298.2572236;

    private double d = 1e-12;

    /**
     * 计算另一点经纬度
     *
     * @param lon    经度
     * @param lat    维度
     * @param brng   方位角
     * @param dist   距离（米）
     */
    public GpsDTO computerThatLonLat(double lon, double lat, double brng, double dist) {

        double alpha1 = rad(brng);
        double sinAlpha1 = Math.sin(alpha1);
        double cosAlpha1 = Math.cos(alpha1);

        double tanU1 = (1 - f) * Math.tan(rad(lat));
        double cosU1 = 1 / Math.sqrt((1 + tanU1 * tanU1));
        double sinU1 = tanU1 * cosU1;
        double sigma1 = Math.atan2(tanU1, cosAlpha1);
        double sinAlpha = cosU1 * sinAlpha1;
        double cosSqAlpha = 1 - sinAlpha * sinAlpha;
        double uSq = cosSqAlpha * (a * a - b * b) / (b * b);
        double aa = 1 + uSq / 16384 * (4096 + uSq * (-768 + uSq * (320 - 175 * uSq)));
        double bb = uSq / 1024 * (256 + uSq * (-128 + uSq * (74 - 47 * uSq)));

        double cos2SigmaM = 0;
        double sinSigma = 0;
        double cosSigma = 0;
        double sigma = dist / (b * aa), sigmaP = 2 * Math.PI;
        while (Math.abs(sigma - sigmaP) > d) {
            cos2SigmaM = Math.cos(2 * sigma1 + sigma);
            sinSigma = Math.sin(sigma);
            cosSigma = Math.cos(sigma);
            double deltaSigma = bb * sinSigma * (cos2SigmaM + bb / 4 * (cosSigma * (-1 + 2 * cos2SigmaM * cos2SigmaM)
                    - bb / 6 * cos2SigmaM * (-3 + 4 * sinSigma * sinSigma) * (-3 + 4 * cos2SigmaM * cos2SigmaM)));
            sigmaP = sigma;
            sigma = dist / (b * aa) + deltaSigma;
        }

        double tmp = sinU1 * sinSigma - cosU1 * cosSigma * cosAlpha1;
        double lat2 = Math.atan2(sinU1 * cosSigma + cosU1 * sinSigma * cosAlpha1,
                (1 - f) * Math.sqrt(sinAlpha * sinAlpha + tmp * tmp));
        double lambda = Math.atan2(sinSigma * sinAlpha1, cosU1 * cosSigma - sinU1 * sinSigma * cosAlpha1);
        double cc = f / 16 * cosSqAlpha * (4 + f * (4 - 3 * cosSqAlpha));
        double ll = lambda - (1 - cc) * f * sinAlpha
                * (sigma + cc * sinSigma * (cos2SigmaM + cc * cosSigma * (-1 + 2 * cos2SigmaM * cos2SigmaM)));

        double revAz = Math.atan2(sinAlpha, -tmp);

        System.out.println(revAz);
        System.out.println(lon + deg(ll) + "," + deg(lat2));

        GpsDTO dto = new GpsDTO();
        dto.setLon(lon + deg(ll));
        dto.setLat(deg(lat2));
        return dto;

    }

    /**
     * 度换成弧度
     *
     * @param d 度
     * @return 弧度
     */
    private double rad(double d) {
        return d * Math.PI / 180.0;
    }

    /**
     * 弧度换成度
     *
     * @param x 弧度
     * @return 度
     */
    private double deg(double x) {
        return x * 180 / Math.PI;
    }

}
